What is the principle of filtering objects with filter paper

The principle of filtering objects with filter paper is based on the different sizes of substances and their interaction forces. Filter paper is usually composed of fiber materials or other porous materials, with many small pores. When the mixture passes through the filter paper, larger substances cannot pass through the pores, while smaller substances can.

Filter paper can filter out larger solid particles or suspended solids, while allowing smaller dissolved substances, molecules, or ions to pass through. This is because solid particles are larger and cannot pass through the pores of the filter paper, while dissolved substances, molecules or ions are smaller and can pass between the pores of the filter paper.

In addition, the pore structure of filter paper can also interact with the surface of the material. For example, some filter papers have electrostatic effects or surface chemical properties, which can adsorb or capture charged or chemically specific substance molecules. This enables filter paper to effectively filter out specific types of substances.

In summary, filter paper achieves filtration through the pore size of the material and the interaction force with the substance, thereby separating larger solid particles or suspended solids while allowing smaller substances to pass through.